Panoramic Roof Module For A Vehicle

ABSTRACT

A vehicle is provided with a panoramic sunroof system. A movable roof panel operates to open and define a panoramic roof opening. In a panoramic open position, the roof panel overlaps at least half of the rear-view window. A split-line of a trunk is defined by the intersection of the roof panel and the trunk lid.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. application Ser. No. 13/439,667 filed Apr. 4, 2012, the disclosure of which is incorporated in its entirety by reference herein.

TECHNICAL FIELD

Various embodiments relate to panoramic roof module assemblies for a vehicle.

BACKGROUND

Vehicle roof assemblies are typically mounted on vehicle bodies to enclose interiors of the vehicles. Various types of roof assemblies have been employed. Some roof assemblies include sunroofs which include may be transparent and/or open to allow occupants to look out the roof the vehicle. Typically, sunroofs only cover a portion of the roof assembly. However, panoramic sunroofs, like those described in U.S. Pat. No. 7,922,242 or 7,828,373 may cover substantially the entire roof to allow passengers to look out almost the entire roof of the vehicle as well as adding aesthetic styling to the vehicle.

SUMMARY

In one embodiment, vehicle is provided with a sunroof system having a movable roof panel operable to define a panoramic roof opening. In a panoramic open position, the roof panel overlaps at least half of the rear-view window. A split-line of a trunk is defined by the intersection of the roof panel and the trunk lid.

In another embodiment, when the trunk is in an open position and the roof panel is in the panoramic open position at least a portion of the trunk overlaps the roof panel.

In another embodiment, the roof panel has a curvature substantially similar to a curvature portion of the rear-view window. In the panoramic open position, the roof panel is offset and generally parallel to the rear-view window.

In another embodiment, the roof panel extends generally from a front pillar to a rear pillar in a closed position. When the roof panel is in the panoramic open position, at least half of the roof panel extend rearward of the rear pillar.

In another embodiment, a front portion of the roof panel has a downward curvature that extends at an angle from an apex of the roof panel when the roof panel is in a closed position. When the roof is in an open position, the front portion of the roof panel generally prevents airflow from going under the roof panel thereby preventing lift forces on the roof panel.

In another embodiment, in the panoramic open position the roof panel overlaps a least a portion of a field of view of the driver through the rear-view window.

In another embodiment, the vehicle includes a wind deflector. The roof panel does not extend above the wind deflector when the roof panel is in the panoramic open position.

In another embodiment, in the panoramic open position, a roof opening has an opening distance of at least 430 millimeters.

In another embodiment, in the panoramic open position, the roof panel is offset less than six inches from the rear-view window.

In one other embodiment a vehicle is provided with a sunroof system having a movable roof panel operable to define a panoramic roof opening. In a panoramic open position, the roof panel overlaps at overlaps a driver's field of vision through a rear-view window.

In another embodiment, the vehicle includes a trunk lid. A split-line of a trunk is defined by the intersection of the roof panel and the trunk lid and when the trunk is in an open position and the roof panel is in the panoramic open position at least a portion of the trunk overlaps the roof panel.

In another embodiment, the roof panel as a curvature substantially similar to a curvature portion of the rear-view window such that in the panoramic open position, the roof panel is offset and generally parallel to the rear-view window.

In another embodiment, the roof panel extends generally from a front pillar to a rear pillar in a closed position. When the roof panel is in the panoramic open position, at least half of the roof panel extend rearward of the rear pillar.

In another embodiment, a front portion of the roof panel has a downward curvature that extends at an angle from an apex of the roof panel when the roof panel is in a closed position and in an open position, the front portion of the roof panel generally prevents airflow from going under the roof panel thereby preventing lift forces on the roof panel.

In another embodiment, in the panoramic open position, a roof opening has an opening distance of at least 430 millimeters

In one other embodiment, a vehicle is provided with a sunroof system having a movable roof panel operable to define a panoramic roof opening. A leading edge of a trunk lid is defined by an intersection of the roof panel and the trunk lid, and when the trunk is in an open position and the roof panel is in a panoramic position at least a portion of the trunk extends over the roof panel.

In another embodiment, the roof panel as a curvature substantially similar to a curvature portion of a rear-view window such that in the panoramic position. The roof panel is offset and generally parallel to the rear-view window.

In another embodiment, the roof panel extends generally from a front pillar to a rear pillar in a closed position. When the roof panel is in the panoramic position, at least half of the roof panel extend rearward of the rear pillar.

In another embodiment, in the panoramic position, a roof opening has an opening distance of at least 430 millimeters.

In another embodiment, a front portion of the roof panel has a downward curvature that extends at an angle from an apex of the roof panel when the roof panel is in a closed position and in an open portion, front portion of the roof panel generally prevents airflow from going under the roof panel thereby preventing lift forces on the roof panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side perspective view of a vehicle having a panoramic roof module assembly according to an embodiment,;

FIG. 2 is another side perspective view of a vehicle wherein the panoramic roof module is illustrated in a plurality of open positions;

FIG. 3 is a rear perspective view of the vehicle having a panoramic roof module assembly from FIG. 1;

FIG. 4 is a top perspective view of the vehicle having a panoramic roof module assembly from FIG. 1, wherein the panoramic roof module illustrated in a closed position;

FIG. 5 is another top perspective view of the vehicle having a panoramic roof module assembly from FIG. 2, the panoramic roof module illustrated in one of the open positions;

FIG. 6 is another side perspective view of the vehicle having a panoramic roof module from FIG. 2, the panoramic roof module illustrated in one of the open positions, and the trunk illustrated in an open position;

FIG. 7 is a schematic illustration of a panoramic roof module control system provided on a vehicle; and

FIG. 8 illustrates a process flowchart for the panoramic roof module control system.

DETAILED DESCRIPTION

As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely examples of the invention that may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

Referring to FIGS. 1 through 6, a four-door passenger vehicle is illustrated and referenced generally by numeral 10. The passenger vehicle 10 has a vehicle body 12, which provides a body structure for the vehicle 10. As illustrated in FIG. 1, the vehicle body structure 12 is for a sedan having four doors including front doors 14 and rear doors 16. The body structure 12 generally defines an opening for the front doors 14 between an A-pillar 18 and a B-pillar 20. Likewise, the body structure 12 generally defines the rear doors 16 between the B-pillar 20 and a C-pillar 22. As in the embodiment illustrated in FIG. 1, the B-pillar may be located inboard of the front doors 14 and rear doors 16 so that the B-pillar is not visible from the exterior of the vehicle 10. The body structure 12 may also include a D-pillar 24 rearward of the C-Pillar 22.

As shown in FIG. 1, the vehicle body structure 12 further defines an opening for a roof 26. As further illustrated in FIG. 1, the roof 26 may be a panoramic roof module assembly 28 such that the roof 26 is formed of transparent material, such as glass or polycarbonate, and collectively forms the entire roof 26.

The body structure 12 includes a front cross member 30 which generally extends between the A-pillars 18 on the lateral sides of the vehicle 10. The body structure 12 also includes a rear cross member 32 which generally extends between the C-pillars 22 and/or D-pillars 24 on the lateral sides of the vehicle 10. The panoramic roof module 28 extends longitudinally between the front cross member 30 and the rear cross member 32. The front and rear cross members 30, 32, in addition to providing torsional support to the vehicle 10 may also provide support for the panoramic roof module 28.

The body structure 12 further includes side beam portions 34 which generally extend longitudinally from the A-pillars 18 to the C-pillars 22 along the lateral sides of the vehicle 10. The side beam portions 34 may be formed integrally with the A-pillar 18 and/or C-pillar 22, or may be formed as a separate structure extending there between. The panoramic roof module 28 extends laterally between the side beam portions 34.

In the illustrated embodiment, the panoramic roof module assembly 28 allows an occupant to look through the entire roof 26 from an interior of the vehicle 10 for the majority of the panoramic roof 26 so that the panoramic opening 50 is unimpeded by structural members, such as an intermediate cross member between the B-pillars. Typically, four door vehicles require intermediate cross members to maintain the structural integrity of the vehicle along the lateral length spanning front and rear doors. The body structure 12 provides structural support against dynamic vehicle forces while still allowing for a moveable panoramic roof panel 26.

A rear-view window 40 is defined laterally between the D-pillars 24. The rear-view window slopes downward from the rear cross member 32 to a rear structure of the vehicle such as the trunk compartment 44. Similarly, a front windshield 42 is defined laterally between the A-pillars 18. The windshield 42 slopes downward from the front cross member 30 to a front structure of the vehicle such as an engine compartment or a hood 46.

As illustrated in FIG. 2, the panoramic roof module 28 is operable so that the roof panel 26 can be opened to reveal a roof opening 50. The roof 26 may be moved to a plurality of positions corresponding to different sized roof openings 50. In the fully opened position, illustrated by reference numeral 52, the roof panel 26 is moved so that the roof panel 26 over substantially overlaps the rear-view window 40. In this position, the roof panel 26 overlaps the driver's field of vision through the rear-view window 40. In the fully open position 52, the driver would be looking through both the rear-view window 40 and roof panel in the rear field of view.

In the illustrated embodiment in FIG. 2, in the fully open position 52, the roof 26 overlaps at least 80% of the rear-view window 40. When the roof 26 overlaps the rear-view window 40, the driver or other occupants can look out the rear of the vehicle through both the roof panel 26 and the rear-view window 40 simultaneously.

In the fully open position 52, a panoramic roof opening 50 extends generally from the front cross member 30 to the rear cross member 32. The panoramic roof opening extends substantially past the B-pillar 20 so that occupants, including passengers in the back seat, can look through the panoramic roof opening 50. The panoramic roof opening 50 is unimpeded by any vehicle structures, such as intermediate cross members between the B-pillars, as in prior art designs. The panoramic roof opening 50 may have an opening distance of more than 600 millimeters open in the longitudinal direction. In another embodiment, the panoramic roof opening distance may be from 500 to 550 millimeters.

The panoramic roof module 28 may also move the roof 26 to a second position, illustrated by reference numeral 56. The second position 56 has an opening distance less than the full panoramic roof opening distance. In one embodiment, the second position 56 has an opening distance of 400 to 450 millimeters. In another embodiment, the second position 56 has an opening distance generally 100 millimeters less than the panoramic position 52. Alternatively, the second position 56 may have an opening distance of 430 millimeters.

The roof panel 26 may be formed with an arc. In another embodiment, the roof panel 26 may be formed with a shaped contour. For example, a front portion 54 of the roof panel 26 may be shaped with a downward sloping arc or angle 0. The front portion 54 may be angled at least five-degrees from a horizontal plane 58. The horizontal plane 58 is define as being parallel to a driving surface an at a tangent to an apex or top curvature portion of the roof panel 26.

By having a downward sloping forward portion 54. The roof panel 26 may be formed with a rear portion 60 that has a longitudinal arc that is substantially similar to the longitudinal arc of the body structure along the D-pillar 40. Likewise, the roof panel 26 may have an arced portion 60 that is generally the same and the longitudinal arc of the rear-view window 40. In the fully open position 52, the roof panel 26 may be positioned at an offset distance substantially parallel to the rear-view window 40.

The arc or contour of the rear portion 60 of the roof panel 26 allows the roof panel 26 to be generally parallel to and offset from the rear-view window 40 a minimal distance. In one embodiment, the roof panel 26 is only offset from the rear-view window 40 by approximately two inches. In another embodiment, the roof panel 26 is offset from the rear-view window 40 by less than six inches. Without the contour of the rear portion 60 being similar to the contour of the rear-view window 40, the roof panel 26 may be offset from the rear-view window 40 a greater distance, which may undesirable for aerodynamic and aesthetic reasons.

In an open position, the downward sloping forward portion 54 of the roof panel 26 generally prevents airflow from going under the roof panel 26 that would cause lift forces on the roof panel 26. Instead, the downward forward portion 54 generally creates a down force on the roof panel 26.

As discussed previously, in at least one embodiment, the roof panel 26 is formed of a polycarbonate material that is transparent. By employing a polycarbonate material for the roof panel 26 the weight for the roof module 28 is reduced when compared to roof assemblies utilizing glass. Additionally, utilization of polycarbonate may permit easily molding of the arcuate shape or contour to cost-effectively form the roof panel 26.

Referring now to FIGS. 3 through 5, the panoramic roof module 28 is described more detail. The panoramic roof module 28 includes, a first side rail 62 and a second side rail 64 that extend longitudinally adjacent each of the side beams 38. Both the first side rail 62 and the second side rail 64 may be elongated along an entire upper side profile of the vehicle 10 between the front cross member 30 and the rear cross member 32. The first side rail 62 and the second side rail 64 may be mounted to the vehicle body structure 12 along the side beam portions 34.

As illustrated, both the first side rail 62 and the second side rail 64 moveably support the roof panel 26. The side rails 62, 64 may extend past the rear door 16 and C-Pillars 22. The side rails 62, 64 may extend generally parallel to the D-pillar 24 and along the rear-view window 40. The side rails 62, 64 may be formed as exposed tracks 66 adjacent the rear-view window 40 and parallel to the D-pillars 24.

The side rails, 62, 64 facilitate movement of the roof panel 26 so that a panoramic opening 50 is created when the roof panel 26 is moved from a closed position, as seen in FIG. 4 to an opened position, as seen in FIG. 5. The side rails 62, 64 cooperate with sliding mechanisms mounted to the roof panel 26. The sliding mechanisms may be mounted to the roof panel 26 in any suitable manner. The sliding mechanisms may slide along the side rails to move the roof panel 26 in a direction indicated by arrow A. In at least one embodiment, the sliding mechanisms are connected to an electrically powered drive unit, such as a motor driven unit, by a cable to move the sliding mechanisms and roof panel 26 along the side rails 62. 64.

The panoramic roof module 28 also includes a lifting mechanism to translate the roof panel 26 in direction indicated by arrow B. When the roof panel 26 is opened, the roof panel 26 is lifted in a generally vertical direction B. Collectively, the sliding mechanisms and the lifting mechanism in the panoramic roof module 28 move the roof panel 26 to an open position, such as the position shown in FIG. 5, without pivoting or tilting of the roof panel 26. By lifting the roof panel 26 a relatively low distance and sliding the roof panel 26 without pivoting, the amount of drag created by the roof panel 26 is minimized.

In at least one embodiment, each of the sliding mechanisms and the lifting mechanism may be connected to an electrically powered drive unit, such as a motor driven gear unit, by a cable to move the sliding mechanisms and roof panel 26 along the side rails 62. 64. Once the roof panel 26 is in an open position, the motor can be reversed to move the sliding mechanisms and the lifting mechanism to return to the closed position, for example. Any suitable motor or electrically powered drive gear unit can be employed within the scope of the embodiments disclosed herein.

The panoramic roof module 28 further includes a wind deflector 70. Generally, when sunroofs are open, wind noise is produced in the passenger compartment 76 of the vehicle. In addition to the broadband noise, resonant interactions between the exterior air flow and the air inside the vehicle create low frequency pressure fluctuations that produce buffeting or a throbbing noise. At critical frequencies, the buffeting or throbbing can be extremely uncomfortable to the vehicle passengers.

The wind deflector 70 is packaged along a forward portion of the panoramic roof module 76 and deploys when the roof panel 26 is moved to an open position. The wind deflector 70 extends above a roof surface 72 when the roof panel 26 is open in order to deflect the air flow away from the panoramic opening 50. In the embodiments illustrated, the deflector 72 may extend above the roof surface 72 to a height that is generally as high as or higher than a top surface of the roof panel 26 when it is an open position.

The rear-view window 40 is defined laterally between the D-pillars 24. The rear-view window slopes downward from the rear cross member 32 to the trunk compartment 44. Similarly, in the fully open position 52, the roof panel 26 slopes downward to the trunk compartment 44. A split-line 80 of the trunk lid 82 is defined as the extrapolated intersection of the arc of the retracted roof panel 26 with the trunk lid 82. The split-line 80 of the trunk lid 82 may also be at the intersection of the rear-view window 40, the arc of the roof panel 26, and the trunk lid 44.

By having the split-line 80 of the trunk lid 82 defined by the intersection of the arc of retracted roof panel 26, this geometric consideration allows the trunk lid 82 to be opened even when the roof panel 26 is in the fully open position 52, as shown in FIG. 6. The split-line 80 may also define the forward leading edge of the trunk lid 80. The split-line 80 or leading edge may have an arc profile in the lateral direction.

Turning now to FIG. 6, the panoramic roof module illustrated the fully open position 52, and the trunk lid 82 is also illustrated in an open position. When the trunk lid 82 is in an open position and the roof panel 26 is in the panoramic open position, at least a portion of the trunk lid 82 overlaps the roof panel 26. The trunk lid 82 is connected to rails 86. The rails 86 allow the trunk lid 82 to pivot open and extend over the retracted roof panel 26.

Wind deflectors generally reduce the broadband noise and also reduce buffeting of air within the vehicle by deflecting air flow away from a sunroof opening. However, in order to effectively reduce the noise and buffeting at higher speeds for a larger panoramic opening 50, as shown in FIG. 2, a wind deflector would be required to extend above the roof surface a significant distance. A large wind deflector may be difficult to package and may be undesirable for aesthetic reasons.

In order to reduce been noise and prevent buffeting, the panoramic roof module 28 may move to different open positions based on the vehicle speed. FIG. 7 illustrates a panoramic roof control system 100 provided on a vehicle 10. The panoramic roof control system 100 may control the open position of the vehicle 10 based on the vehicle speed, or other environmental factors.

As shown, the panoramic roof control system 100 includes a vehicle controller 110 or microprocessor that is operable to process instructions to and from various components of the panoramic roof control system 100. This microprocessor 110 could be a dedicated processor or the panoramic roof control system 100 could share a controller with other vehicle-based systems.

The panoramic roof control system 100 may also be provided with one or more vehicle-based sensors 112. For example, the sensors 112 may include vehicle speed sensors, wind speed sensors, environmental sensors or any other suitable sensors. For example, a wind speed sensor 112 may detect the resulting wind speed based on the vehicle speed in combination with any ambient wind.

The microprocessor 110 may be in communication with a vehicle network 116. The vehicle network 116 continuously broadcasts data and information to the vehicle-based systems. The vehicle network 116 may be a controlled area network (CAN) bus used to pass data to and from the microprocessor 110 (or components thereof).

For example, the vehicle communication network 116 may continuously provide the vehicle speed signal or information for use by dynamic vehicle systems such as the braking system. A roof module controller 120 may also be in communication with the vehicle network 116. The roof module controller 120 may continuously access the real time vehicle information, such as vehicle speed. If the vehicle's speed is at a threshold speed above which makes wind buffeting likely or possible, the roof module controller 120 may be moved to the roof panel 26 to position to reduce the wind buffeting effects. Alternatively, a warning may be given to the driver through a visual display 122 in communication with vehicle network 116 or the microprocessor 110.

The roof module controller 120 may be in communication with a roof drive unit 124. In one embodiment, the roof drive unit 124 moves the roof panel 26 based on information from the vehicle network 116. The drive unit 124 may be a motor, as discussed previously. A motor may detect the position of the roof panel 26 based on a count of revolutions by the motor. In another embodiment, the panoramic roof control system 100 may include sensors in the panoramic roof module 28 which detect the position of the roof panel 26. However, any suitable drive unit and/or position detection mechanism may be employed for moving and detecting the position of the roof panel 26.

Turning now to FIG. 8, a process 200 for controlling the panoramic roof module 28 is illustrated. The roof module controller may control the roof module if it is in an open position, as represented by block 210. If the roof module is open, the controller monitors vehicle information from the vehicle communication network. In particular, the controller may monitor the vehicle speed.

Based on the vehicle data, the controller determines the vehicle's relative wind speed, as represented by block 214. The relative wind speed of the vehicle may be a combination of the vehicle speed and ambient wind speed. If the vehicle is not equipped to sense ambient wind speed, the controller may infer vehicle speed as relative wind speed.

Next, the controller determines the roof module position, as represented by block 216. As discussed above, the controller may count the number of rotations of the motor to determine the roof panel position. However, the controller may use other suitable methods for determining the roof panel position.

Finally, the controller may command a drive unit to adjust the roof module position based on the relative wind speed, as represented by block 218. For example, if the roof panel is in a fully open position, and the vehicle speed exceeds a threshold value, the controller may command the drive unit to move the roof panel to a second position, which decreases the opening distance of the panoramic roof module and reduces wind buffeting.

In one example, the panoramic roof module 28 may position the roof panel 26 in the fully open position 52. When the roof module controller 120 receives information that the vehicle speed is at least 65 km/h, the controller 120 moves the roof panel 26 to the second open position 56 in order to prevent wind buffeting in the passenger compartment of the vehicle 10. In another example, the controller receives information about vehicle speed and wind speed, the controller 120 may move the roof panel 26 to the second position 56 when the vehicle speed is 70 km/h and no headwind is detected.

While exemplary embodiments are described above, it is not intended that these embodiments describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention. Additionally, the features of various implementing embodiments may be combined to form further embodiments of the invention. 

What is claimed is:
 1. A vehicle comprising: a rear-view window; a sunroof system having a movable roof panel operable to define a panoramic roof opening, wherein in a panoramic open position, the roof panel overlaps at least half of the rear-view window; and a trunk lid, wherein a split-line of a trunk is defined by the intersection of the roof panel and the trunk lid.
 2. The vehicle of claim 1 wherein when the trunk is in an open position and the roof panel is in the panoramic open position at least a portion of the trunk overlaps the roof panel.
 3. The vehicle of claim 1 wherein the roof panel has a curvature substantially similar to a curvature portion of the rear-view window such that in the panoramic open position, the roof panel is offset and generally parallel to the rear-view window.
 4. The vehicle of claim 1 wherein the roof panel extends generally from a front pillar to a rear pillar in a closed position and when the roof panel is in the panoramic open position, at least half of the roof panel extend rearward of the rear pillar.
 5. The vehicle of claim 1 wherein a front portion of the roof panel has a downward curvature that extends at an angle from an apex of the roof panel when the roof panel is in a closed position, and wherein an open position, the front portion of the roof panel generally prevents airflow from going under the roof panel thereby preventing lift forces on the roof panel.
 6. The vehicle of claim 1 wherein in the panoramic open position the roof panel overlaps a least a portion of a field of view through the rear-view window.
 7. The vehicle of claim 1 further comprising a wind deflector, wherein the roof panel does not extend above the wind deflector when the roof panel is in the panoramic open position.
 8. The vehicle of claim 1 wherein in the panoramic open position, a roof opening has an opening distance of at least 430 millimeters.
 9. The vehicle of claim 1 wherein in the panoramic open position, the roof panel is offset less than six inches from the rear-view window.
 10. A vehicle comprising: a rear view window; and a sunroof system having a movable roof panel operable to define a panoramic roof opening, wherein in a panoramic open position, the roof panel overlaps at overlaps a driver's field of vision through a rear-view window.
 11. The vehicle of claim 10 further comprising a trunk lid, wherein a split-line of a trunk is defined by the intersection of the roof panel and the trunk lid and when the trunk is in an open position and the roof panel is in the panoramic open position at least a portion of the trunk overlaps the roof panel.
 12. The vehicle of claim 10 wherein the roof panel as a curvature substantially similar to a curvature portion of the rear-view window such that in the panoramic open position, the roof panel is offset and generally parallel to the rear-view window.
 13. The vehicle of claim 10 wherein the roof panel extends generally from a front pillar to a rear pillar in a closed position, and when the roof panel is in the panoramic open position, at least half of the roof panel extend rearward of the rear pillar.
 14. The vehicle of claim 10 wherein a front portion of the roof panel has a downward curvature portion that extends at an angle from an apex of the roof panel when the roof panel is in a closed position, and in an open position, the front portion of the roof panel generally prevents airflow from going under the roof panel thereby preventing lift forces on the roof panel.
 15. The vehicle of claim 10 wherein in the panoramic open position, a roof opening has an opening distance of at least 430 millimeters
 16. A vehicle comprising: a sunroof system having a movable roof panel operable to define a panoramic roof opening; and a trunk lid, wherein a leading edge of the trunk lid is defined by an intersection of the roof panel and the trunk lid, and when the trunk is in an open position and the roof panel is in a panoramic position at least a portion of the trunk extends over the roof panel.
 17. The vehicle of claim 16 wherein the roof panel as a curvature substantially similar to a curvature portion of a rear-view window such that in the panoramic position, the roof panel is offset and generally parallel to the rear-view window.
 18. The vehicle of claim 16 wherein the roof panel extends generally from a front pillar to a rear pillar in a closed position, and when the roof panel is in the panoramic position, at least half of the roof panel extend rearward of the rear pillar.
 19. The vehicle of claim 16 wherein in the panoramic position, a roof opening has an opening distance of at least 430 millimeters.
 20. The vehicle of claim 16 wherein a front portion of the roof panel has a downward curvature that extends at an angle from an apex of the roof panel when the roof panel is in a closed position and in an open portion, front portion of the roof panel generally prevents airflow from going under the roof panel thereby preventing lift forces on the roof panel. 